THE AGENT
All that was known for a long time was that this mysterious person serves the Gods of Dark, and that he knew the true names of Azariel, Cava, and Overkill.
See the log Our Conquest Begins for more. Since that first log, the Agent has written many more. Please see the Character Logs page- the Agent is at the bottom.
The Agent is eventually revealed to be the jinn Zizean.
Later, on the 16th of Set, 112, a change in the Agent is revealed. It is now the Night Owl Helgriven.
Picture from our own AZ Rune.